Messages in Moodle can be sent to Message output plugins, users can use these to choose where they want messages to go.
Join the discussions about messaging plugins in the General add-ons forum.
Messaging: Mobile notifications
Message output plugin that enables mobile push notifications in the official Moodle Mobile app. See http://docs.moodle.org/en/Mobile_app_Push_Notifications for more information This plugin will be integrated in Moodle core starting version 2.7.
moodletxt+ is an SMS message processor for Moodle 2.0 and above. It is an extension to the existing moodletxt block, which for six years has been one of the most advanced 2-way SMS messaging blocks available to Moodle users. This new extension allows moodletxt to capture site/course notifications, personal messages and other message events within Moodle, and then send those messages out via SMS.